Hi José.

>How I can do a Singleton Pattern Class in VFP?

One of the ways you can do this is to use a Class Factory instead of instantiating the class directly. With a class factory, you ask one class to create objects of other classes for you. Beside the run-time flexibility this provides (you can change the class being instantiated more easily), this can support singleton classes: the class factory object checks to see if it has already created a singleton object (it obviously will have to maintain a reference to the singleton object) and if so, return the reference to that object rather than creating a new one.

Doug